Improved film blowing equipment and film blowing process thereof

Abstract

The invention relates to the technical field of film blowing equipment, and provides improved film blowing equipment and a film blowing process thereof.The improved film blowing equipment comprises an extrusion barrel, a discharging pipe, a die head, a cutting mechanism, a winding machine, a propeller strut arranged at an outlet of the die head, a traction mechanism arranged above the propeller strut and a base frame connected between the traction mechanism and the propeller strut. The herringbone frame comprises a frame body arranged in a splayed shape, supporting shafts on the two sides of the frame body and a first transmission assembly used for adjusting the two supporting shafts to be close to or away from each other at the same time. A balancing frame is connected to the frame body in a pivoted mode and is parallel to the cross section of the propeller strut. The traction mechanism comprises a fixing plate, a rotating frame, a conveying roller and an adjusting assembly. A plurality of tensioning rollers are arranged on the adjusting assembly, the angle of each tensioning roller relative to the fixing plate can be adjusted, and a film passes through the position between the two conveying rollers and is sequentially wound around the tensioning rollers. The adaptation degree of the herringbone clamping plate and the film bubble diameter is improved, the film conveying tension is adjusted by adjusting the angle of the tensioning roller of the traction mechanism, and the film quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of film blowing equipment, in particular to an improved film blowing equipment and a film blowing process for processing a film using the improved film blowing equipment. Background Art

[0002] Film blowing equipment primarily consists of several key components, including the extruder, die head, cooling system, traction system, and winder. The herringbone frame, located between the die and traction system, stabilizes the film bubble, preventing deformation during the blowing process and ensuring its stability and flatness. By clamping the bubble, it helps evenly cool and solidify, thereby ensuring film quality. During production, the angle of the herringbone frame must be adjusted according to the diameter of the bubble. However, due to its large size, it is difficult to maintain geometric symmetry during adjustment, resulting in a rough, uneven film surface that is prone to wrinkles and unevenness. In severe cases, this can even cause cloudy water marks on the film, directly impacting film quality.

[0003] The traction mechanism in film blowing equipment is primarily used to pull and stretch the film, enhancing its longitudinal strength, controlling film thickness, preventing air leaks, and ensuring stable film folding diameter. Adjusting the traction mechanism is complex, requiring precise control of the speed and force of the traction rollers to ensure film quality and stability. The angle of existing traction rollers cannot be adjusted. The film traction process primarily relies on the rotational speed of the transmission rollers from the A-frame, making the tension between the transmission rollers and the subsequent cutting mechanism difficult to adjust. Furthermore, uneven pressure from the traction machine's nip rollers can easily cause the film bubble to deviate, making it impossible to ensure the bubble remains balanced during the traction process. The uneven surface roughness of the traction rollers can lead to air intrusion into the film bubble.

[0004] Furthermore, uneven distribution of cooling air can cause the film bubble to form a gourd-shaped bubble during long-distance transport in the herringbone frame, affecting the final film shape and thickness. Furthermore, inconsistent or excessively loose clamping force on both sides of the traction rollers, or inaccurate balance of the traction rollers, can prevent the film thickness from reaching the desired value, thus affecting film quality. Summary of the Invention

[0005] In view of this, the present invention aims to propose an improved film blowing equipment to improve the adaptability of the herringbone splint and the bubble diameter, and to adjust the film transmission tension by adjusting the angle of the clamping roller in the traction mechanism to improve the film quality.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] An improved film blowing equipment comprises an extruder, a discharge pipe, a die head, a cutting mechanism, and a winder, and also comprises a herringbone frame provided at the die head outlet, a traction mechanism provided above the herringbone frame, and a base frame connected between the traction mechanism and the herringbone frame;

[0008] The herringbone frame includes a frame body arranged in an eight-shaped shape, and support shafts arranged on both sides of the frame body, and a first transmission assembly for adjusting the two support shafts to move closer to or farther away from each other at the same time;

[0009] A balancing frame is pivotally connected to the frame body, and the balancing frame is parallel to the cross section of the herringbone frame;

[0010] The traction mechanism includes a fixed plate provided above the base frame, a rotating frame pivotally connected to the middle of the fixed plate, a conveying roller pivotally connected to the rotating frame, and an adjustment assembly provided on the upper part of the conveying assembly;

[0011] The adjustment assembly is provided with a plurality of tensioning rollers spaced apart in the height direction, and the angle of each tensioning roller relative to the fixed plate is adjustable. The film passes between two conveying rollers and is wound around each tensioning roller in sequence.

[0012] Furthermore, the frame includes two relatively arranged split bodies, each split body includes two spaced support plates, and is pivotally connected to a plurality of guide shafts, and the plurality of guide shafts are spaced apart along the extension direction of the support plates.

[0013] Furthermore, a second transmission assembly is provided between the two split bodies, and the base frame is constructed around the outside of the herringbone frame;

[0014] The second transmission assembly includes a second driving part, a first screw provided at a power output end of the second driving part, a retaining block screwed to the first screw, and a connecting rod pivotally connected to the retaining block;

[0015] The center lines of the two connecting rods provided on the retaining block coincide with the center lines of the two split bodies;

[0016] The other ends of the two connecting rods are respectively connected to two oppositely arranged split bodies.

[0017] Furthermore, the other end of the connecting rod is connected to a pin shaft, and the two pin shafts are pivotally arranged on the retaining block;

[0018] The two pin shafts are respectively connected with gear discs for relative meshing transmission, and the two gear discs are respectively fixedly connected to the two pin shafts.

[0019] Furthermore, a through hole is provided in the middle of the fixed plate, and part of the split body passes through the fixed plate, forming a channel between the two split bodies, and the channel is correspondingly provided below the two conveying rollers;

[0020] The base frame is further provided with an adjustment plate, which is fixedly connected to the side wall of the through hole;

[0021] A first long slot is formed on the adjustment plate, and the support shaft is inserted into the first long slot.

[0022] Furthermore, the first transmission assembly includes a width adjustment unit and a height adjustment unit;

[0023] The width adjustment unit includes a connecting arm pivotally connected to the support shaft, two connecting arms pivotally connected to the pressing block, and a first driving part for driving the pressing block to move up and down;

[0024] The first driving part is connected above the fixing plate, and the center line of the pressing block coincides with the center line of the frame;

[0025] The connecting arms are arranged in a one-to-one correspondence with the supporting shafts.

[0026] Furthermore, the height adjustment unit includes a second screw connected to the support shaft, and a third driving part for driving the second screw to rotate;

[0027] An adjustment plate is provided at one end of the support plate close to the support shaft. The adjustment plate is arranged along the extension direction of the support plate. A second long slot hole is provided in the extension direction of the adjustment plate. The second screw rod passes through the adjustment plate along the length direction.

[0028] Furthermore, the balancing frame includes rotating arms respectively provided on both sides of the split body, a first connecting shaft passing through the two rotating arms, and a second connecting shaft vertically connected between the two split bodies;

[0029] The first connecting shaft and the second connecting shaft are connected through a shaft seat;

[0030] Linear bearings are provided between the first connecting shaft, the second connecting shaft and the shaft seat.

[0031] Furthermore, the adjustment assembly includes a fixed shaft connected to the fixed plate, a first frame, a second frame, and a third frame sequentially sleeved on the fixed shaft, a rotating shaft connected to the rotating frame, and a gear set for driving the frame to rotate;

[0032] The plurality of tensioning rollers are respectively pivotally connected to the plurality of frames;

[0033] The gear set includes a first gear and a second gear connected to the rotating shaft, and a third gear and a fourth gear connected to the fixed shaft;

[0034] The first frame is connected to the third gear, and the third frame is connected to the fourth gear;

[0035] The first gear is meshed with the third gear for transmission, and the second gear is meshed with the fourth gear for transmission;

[0036] The fixed shaft is further connected to a fourth driving part, and a power output end of the fourth driving part is connected to the second frame;

[0037] The fourth driving part is connected to the rotating shaft through a mounting seat.

[0038] Compared with the prior art, the present invention has the following advantages:

[0039] In the improved film blowing equipment described herein, a herringbone frame is connected to an upper traction mechanism via a base frame to align the film extrusion position with the conveyor roller position. A first transmission assembly simultaneously adjusts the two support shafts toward or away from each other. A balancing frame is provided on the frame to maintain the symmetrical balance of the herringbone frame during angle adjustment, effectively preventing uneven and wrinkled film surfaces and ensuring film quality. Simultaneously, the adjustment assembly adjusts multiple tensioning rollers, each with an adjustable angle. This prevents localized excessive or insufficient tension during film pulling, increases adjustment flexibility, and allows precise control of the speed and force of the traction rollers to ensure film quality and stability.

[0040] Another object of the present invention is to provide a film blowing process, using the improved film blowing equipment as described above, which specifically includes the following steps:

[0041] S1. Raw material preparation: plastic particles are mixed in a predetermined ratio and the moisture is removed through a drying process;

[0042] S2, extrusion film forming, in the extrusion barrel, the plastic particles are melted and pass through the die to form a continuous molten plastic flow;

[0043] S3, blowing and cooling, the molten plastic is cooled and blown by the air ring to gradually form a film bubble;

[0044] S4, splinting treatment, the film bubble passes through the herringbone frame longitudinally upward, and the angle of the herringbone frame is adjusted by the first transmission assembly and the second transmission assembly to squeeze the film bubble into a sheet;

[0045] S5, stretching process, the cooled and solidified film is stretched by a traction mechanism. During the traction process, the tension of the film is measured by a pressure sensor. When the tension exceeds a predetermined threshold, the adjustment component is activated to adjust the angle of the tension roller until the tension of the film reaches the predetermined threshold;

[0046] S6, trimming and winding, after trimming the waste edges on both sides of the film, the winding machine rewinds it online.

[0047] The blown film process of the present invention utilizes the improved blown film equipment described above. During the film bubble's clamping stage, the first and second transmission assemblies adjust the angle of the herringbone in real time. This ensures the squeeze force of the film bubble, preventing wrinkles and unevenness in the film. Furthermore, the film tension is adjusted in real time during the stretching stage, improving film quality. This process eliminates the need for independent downtime adjustments; real-time adjustments are made during the film forming process, ensuring the orderly operation of the production line, ensuring film quality, and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0049] Figure 1 This is a structural layout diagram of the improved film blowing equipment according to an embodiment of the present invention, excluding the cutting mechanism and the winding machine;

[0050] Figure 2 It is a three-dimensional schematic diagram of the herringbone frame and the traction mechanism according to an embodiment of the present invention;

[0051] Figure 3 A three-dimensional schematic diagram of the herringbone frame according to an embodiment of the present invention;

[0052] Figure 4 A schematic top view of the herringbone frame according to an embodiment of the present invention;

[0053] Figure 5 It is a cross-sectional schematic diagram at AA;

[0054] Figure 6 is a three-dimensional schematic diagram of a traction mechanism according to an embodiment of the present invention;

[0055] Figure 7 This is a schematic front view of a traction mechanism according to an embodiment of the present invention;

[0056] Figure 8 for Figure 7 Schematic cross-sectional view at the middle BB.

[0057] Description of reference numerals:

[0058] 1. Extruder barrel; 2. Discharge pipe; 3. Die head; 4. Main motor; 5. Fixed frame; 6. Herringbone frame; 7. Traction mechanism; 8. Base frame; 9. Channel; 10. Adjustment plate;

[0059] 601, frame; 602, support shaft; 603, first transmission assembly; 604, balance frame; 605, second transmission assembly;

[0060] 701, fixed plate; 702, rotating frame; 703, conveying roller; 704, adjustment assembly; 705, first frame; 706, second frame; 707, third frame;

[0061] 1001, first long slot;

[0062] 6011, support plate; 6012, guide shaft;

[0063] 6031, connecting arm; 6032, first driving unit; 6033, pressing block; 6034, second screw; 6035, third driving unit; 6036, adjustment plate;

[0064] 6041, rotating arm; 6042, first connecting shaft; 6043, second connecting shaft; 6044, shaft seat;

[0065] 6051, second drive unit; 6052, first screw; 6053, holding block; 6054, connecting rod; 6055, pin; 6056, gear plate;

[0066] 7041, fixed shaft; 7042, rotating shaft; 7043, first gear; 7044, second gear; 7045, third gear; 7046, fourth gear; 7047, fourth driving unit; 7048, tension roller;

[0067] 60361, the second long slot hole. DETAILED DESCRIPTION

[0068] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other.

[0069] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," and "back" and other terms indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0070] Furthermore, in the description of the present invention, unless otherwise expressly defined, the terms "mounted," "connected," "connect," and "connector" should be interpreted broadly. For example, these terms may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will appreciate the specific meanings of these terms in the present invention based on the specific circumstances.

[0071] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0072] This embodiment relates to an improved film blowing equipment, including an extruder 1, a discharge pipe 2, a die head 3, a cutting mechanism, and a winder. As a whole, Figure 1 As shown, the improved film blowing equipment further includes a herringbone frame 6 disposed at the exit of the die head 3, a traction mechanism 7 disposed above the herringbone frame 6, and a base frame 8 connected between the traction mechanism 7 and the herringbone frame 6. The herringbone frame 6 includes a frame body 601 arranged in an eight-shaped shape, support shafts 602 disposed on both sides of the frame body 601, and a first transmission assembly 603 for adjusting the two support shafts 602 to move closer or farther away from each other at the same time.

[0073] A balancing frame 604 is pivotally connected to the frame body 601, parallel to the cross-section of the herringbone frame 6. The traction mechanism 7 comprises a fixed plate 701 positioned above the base frame 8, a rotating frame 702 pivotally connected to the center of the fixed plate 701, a conveyor roller 703 pivotally connected to the rotating frame 702, and an adjustment assembly 704 positioned above the conveyor assembly. The adjustment assembly 704 is equipped with multiple tensioning rollers 7048 spaced apart along the height direction. The angle of each tensioning roller 7048 relative to the fixed plate 701 is adjustable. The film passes between two conveyor rollers 703 and is sequentially wound around each tensioning roller 7048.

[0074] As described above, in the improved film blowing equipment of this embodiment, the herringbone frame 6 is connected to the upper traction mechanism 7 through the base frame 8 to determine the film extrusion position corresponding to the position of the conveyor roller 703, and the two support shafts 602 are simultaneously adjusted to move closer or farther away from each other through the first transmission component 603. A balance frame 604 is provided on the frame body 601 to ensure that the shape of the herringbone frame 6 is always symmetrical and balanced during the angle adjustment process of the herringbone frame 6, effectively avoiding uneven and wrinkled surfaces on the film and ensuring the quality of the film. At the same time, the adjustment component 704 is used to adjust the multiple tensioning rollers 7048, and the angle of each tensioning roller 7048 is adjustable. The problem of excessive or insufficient local tensioning force will not occur during the film pulling process, increasing the adjustment flexibility and accurately controlling the speed and force of the pulling rollers to ensure the quality and stability of the film.

[0075] Based on the above overall introduction, an exemplary structure of the improved film blowing equipment of this embodiment is arranged in the order of a material barrel for feeding, an extrusion cylinder 1, a discharge pipe 2, a die head 3, an A-frame 6, a traction mechanism 7, a cutting mechanism, a winder and other equipment.

[0076] As a preferred embodiment, Figures 1 to 2 As shown, the frame 601 comprises two opposing parts, each of which includes two spaced-apart support plates 6011 and a plurality of guide shafts 6012 pivotally connected thereto. The guide shafts 6012 are spaced apart along the extension direction of the support plates 6011. The support plates 6011 are formed into planar plates, and the guide shafts 6012 are connected to the support plates 6011 via deep groove ball bearings. A support rod may also be provided between the two support plates 6011, and the guide shafts 6012 are sleeved onto the support rod for easy removal and replacement.

[0077] like Figures 3 to 5 As shown, a second transmission assembly 605 is disposed between the two split bodies, and the base frame 8 is constructed around the outside of the A-shaped frame 6. The second transmission assembly 605 includes a second drive unit 6051, a first screw 6052 disposed at the power output end of the second drive unit 6051, a retaining block 6053 threadedly connected to the first screw 6052, and a connecting rod 6054 pivotally connected to the retaining block 6053. The centerlines of the two connecting rods 6054 disposed on the retaining block 6053 coincide with the centerlines of the two split bodies. The other ends of the two connecting rods 6054 are respectively connected to the two oppositely disposed split bodies.

[0078] Specifically, as Figures 3 to 5 As shown, the second driving part 6051 of this embodiment adopts a servo motor. The second driving part 6051 is fixed on the base frame 8, and a connecting plate is provided on the base frame 8. When the second driving part 6051 rotates, the first screw 6052 rotates to make the retaining block 6053 move up and down along the axial direction of the first screw 6052, and the angle between the splits is changed by the pulling force of the connecting rod 6054.

[0079] Further, if Figures 4 and 5 As shown, the other end of the connecting rod 6054 is connected to a pin 6055, and the two pins 6055 are pivotally mounted on the retaining block 6053. The two pins 6055 are respectively connected to a geared disc 6056 that meshes with each other, and the two geared discs 6056 are respectively fixedly connected to the two pins 6055. The meshing transmission of the two geared discs 6056 can effectively ensure that the rotation angles of the two connecting rods 6054 are synchronized, thereby preventing deviation during the adjustment of the A-shaped frame 6.

[0080] In addition, if Figure 6As shown, a through hole is provided in the middle of the fixed plate 701, through which a portion of the split body passes, forming a channel 9 between the two split bodies. Channel 9 is correspondingly positioned below the two conveyor rollers 703. An adjustment plate 10 is also provided on the base frame 8, fixedly connected to the sidewalls of the through hole. A first elongated slot 1001 is formed in the adjustment plate 10, into which the support shaft 602 is inserted. The through hole is a rectangular hole (not shown in the figure), and the opening of the through hole is larger than the length and width of the herringbone frame 6.

[0081] Further, if Figures 3 to 5 As shown, the first transmission assembly 603 includes a width adjustment unit and a height adjustment unit, and the width adjustment unit includes a connecting arm 6031 pivotally connected to the support shaft 602, two connecting arms 6031 pivotally connected to the pressure block 6033, and a first driving part 6032 for driving the pressure block 6033 to move up and down. The first driving part 6032 is connected above the fixed plate 701, and the center line of the pressure block 6033 coincides with the center line of the frame body 601. The connecting arms 6031 and the support shafts 602 are arranged in a one-to-one correspondence. The first driving part 6032 of this embodiment adopts a telescopic cylinder. When the piston rod of the first driving part 6032 extends downward, the two support shafts 602 move away from each other to adjust the angle and spacing of the upper end of the herringbone frame 6 to adapt to the diameter of the film bubble.

[0082] In addition, if Figure 3 As shown, the height adjustment unit includes a second screw 6034 connected and threaded on the support shaft 602, and a third driving part 6035 for driving the second screw 6034 to rotate. An adjustment plate 6036 is provided at one end of the support plate 6011 close to the support shaft 602. The adjustment plate 6036 is arranged along the extension direction of the support plate 6011. A second long slot hole 60361 is provided in the extension direction of the adjustment plate 6036, and the second screw 6034 passes through the length direction of the adjustment plate 6036.

[0083] Specifically, if Figures 3 to 5 As shown, height adjustment units are provided at each end of the split body. The third drive unit 6035 comprises a circular shaft connected between the two support plates 6011, driving bevel gears located at each end of the shaft, a driven bevel gear connected to the second screw 6034, and a drive motor for rotating the shaft. The drive motor drives the second screws 6034 at each end through the shaft, which in turn rotates the second screws 6034 at each end, thereby adjusting the height of the support shaft 602 relative to the support plates 6011, thereby achieving the purpose of adjusting the overall height of the frame body 601.

[0084] As a preferred embodiment, Figure 3As shown, the balancing frame 604 includes rotating arms 6041, one on each side of the split body, a first connecting shaft 6042 extending through the two rotating arms 6041, and a second connecting shaft 6043 perpendicularly connected between the two split bodies. The first connecting shaft 6042 and the second connecting shaft 6043 are connected via a shaft seat 6044. Linear bearings are provided between the first and second connecting shafts 6042, 6043, and the shaft seat 6044. The horizontal position of the first and second connecting shafts 6042, 6043 is controlled by the shaft seat 6044, ensuring a constant position of the balancing frame 604, thus enhancing the stability of the entire frame 601.

[0085] In addition, if Figures 6 to 8 As shown, the adjustment assembly 704 includes a fixed shaft 7041 connected to the fixed plate 701, a first frame 705, a second frame 706, and a third frame 707 sequentially sleeved on the fixed shaft 7041, a rotating shaft 7042 connected to the rotating frame 702, and a gear set for driving the frame to rotate. A plurality of tension rollers 7048 are pivotally connected to each of the frames.

[0086] The gear train includes a first gear 7043 and a second gear 7044 connected to the rotating shaft 7042, and a third gear 7045 and a fourth gear 7046 connected to the fixed shaft 7041. The first frame 705 is connected to the third gear 7045, and the third frame 707 is connected to the fourth gear 7046. The first gear 7043 and the third gear 7045 are meshed and driven, and the second gear 7044 and the fourth gear 7046 are meshed and driven. A fourth drive unit 7047 is also connected to the fixed shaft 7041, and the power output end of the fourth drive unit 7047 is connected to the second frame 706. The fourth drive unit 7047 is connected to the rotating shaft 7042 via a mounting base.

[0087] The fourth drive unit 7047 utilizes a servo motor. The main motor 4 drives the rotating frame 702 to rotate along the axis of the fixed plate 701. The fixed plate 701 is provided with a fixed frame 5. A fixed shaft 7041 is connected to the fixed frame 5. A circular gear is sleeved onto the fixed shaft 7041, and a small circular gear is sleeved onto the rotating shaft 7042, which fits within the inner core of the circular gear. When the main motor 4 is activated, the rotating frame 702 rotates, driving the rotating shaft 7042 in turn. This causes the first gear 7043 to rotate relative to the third gear 7045, which in turn drives the tensioning pulley on the first frame 705 in rotation. At the same time, the second gear 7044 is engaged with the fourth gear 7046, driving the tensioning wheel on the third frame 707 to rotate, and the fourth driving unit 7047 independently drives the second frame 706 located in the middle. When the tensioning force on the second frame 706 changes the angle, the tensioning force of the film on the first frame 705 and the third frame 707 changes at the same time to adjust the tensioning force to a predetermined threshold range. The specific tension threshold is set according to production experience.

[0088] This embodiment also relates to a film blowing process, which uses the improved film blowing equipment described above and specifically includes the following steps:

[0089] S1. Raw material preparation: plastic particles are mixed in a predetermined ratio and the moisture is removed through a drying process;

[0090] S2, extrusion film forming, in the extrusion barrel 1, the plastic particles are melted and pass through the die 3 to form a continuous molten plastic flow;

[0091] S3, blowing and cooling, the molten plastic is cooled and blown by the air ring to gradually form a film bubble;

[0092] S4, splinting treatment, the film bubble passes through the herringbone frame 6 longitudinally upward, and the angle of the herringbone frame 6 is adjusted by the first transmission assembly 603 and the second transmission assembly 605 to squeeze the film bubble into a sheet;

[0093] S5, stretching process: the cooled and solidified film is stretched by the traction mechanism 7. During the traction process, the tension of the film is measured by the pressure sensor. When the tension exceeds a predetermined threshold, the adjustment component 704 is activated to adjust the angle of the tension roller 7048 until the tension of the film reaches the predetermined threshold.

[0094] S6, trimming and winding, after trimming the waste edges on both sides of the film, the winding machine rewinds it online.

[0095] The blown film process of this embodiment utilizes the improved blown film equipment described above. During the film bubble's clamping stage, the first transmission assembly 603 and the second transmission assembly 605 adjust the angle of the herringbone frame 6 in real time. This ensures the squeeze force of the film bubble, preventing wrinkles and unevenness in the film. Furthermore, by adjusting the film tension in real time during the stretching stage, film quality is improved. This process eliminates the need for independent downtime adjustments; real-time adjustments are made during the film forming process, ensuring the orderly operation of the production line, ensuring film production quality, and improving production efficiency.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An improved film blowing equipment, comprising an extruder (1), a discharge pipe (2), a die head (3), a cutting mechanism, and a winder, characterized in that: It also includes a herringbone frame (6) provided at the outlet of the die head (3), a traction mechanism (7) provided above the herringbone frame (6), and a base frame (8) connected between the traction mechanism (7) and the herringbone frame (6); The herringbone frame (6) comprises a frame body (601) arranged in an eight-shaped shape, support shafts (602) arranged on both sides of the frame body (601), and a first transmission assembly (603) for adjusting the two support shafts (602) to move closer to or farther away from each other at the same time; A balancing frame (604) is pivotally connected to the frame body (601), and the balancing frame (604) is parallel to the cross section of the herringbone frame (6); The traction mechanism (7) comprises a fixed plate (701) arranged above the base frame (8), a rotating frame (702) pivotally connected to the middle of the fixed plate (701), a conveying roller (703) pivotally connected to the rotating frame (702), and an adjustment assembly (704) arranged above the conveying assembly; The adjustment assembly (704) is provided with a plurality of tensioning rollers (7048) spaced apart in the height direction, and the angle of each tensioning roller (7048) relative to the fixed plate (701) is adjustable. The film passes between two conveying rollers (703) and is wound around each tensioning roller (7048) in sequence.

2. The improved film blowing equipment according to claim 1, characterized in that: The frame (601) includes two relatively arranged split bodies, each split body includes two spaced support plates (6011) and a plurality of guide shafts (6012) pivotally connected thereto, wherein the plurality of guide shafts (6012) are spaced apart along the extension direction of the support plates (6011).

3. The improved film blowing equipment according to claim 2, characterized in that: A second transmission assembly (605) is further provided between the two split bodies, and the base frame (8) is constructed around the outside of the herringbone frame (6); The second transmission assembly (605) includes a second driving part (6051), a first screw (6052) provided at the power output end of the second driving part (6051), a retaining block (6053) screwed onto the first screw (6052), and a connecting rod (6054) pivotally connected to the retaining block (6053); The center lines of the two connecting rods (6054) provided on the retaining block (6053) coincide with the center lines of the two split bodies; The other ends of the two connecting rods (6054) are respectively connected to two oppositely arranged split bodies.

4. The improved film blowing equipment according to claim 3, characterized in that: The other end of the connecting rod (6054) is connected to a pin shaft (6055), and the two pin shafts (6055) are pivotally arranged on the retaining block (6053); The two pin shafts (6055) are respectively connected to toothed discs (6056) for relative meshing transmission, and the two toothed discs (6056) are respectively fixedly connected to the two pin shafts (6055).

5. The improved film blowing equipment according to claim 4, characterized in that: A through hole is provided in the middle of the fixed plate (701), and part of the split bodies pass through the fixed plate (701), forming a channel (9) between the two split bodies, and the channel (9) is correspondingly provided below the two conveying rollers (703); The base frame (8) is further provided with an adjustment plate (10), and the adjustment plate (10) is fixedly connected to the side wall of the through hole; A first long slot hole (1001) is formed on the adjustment plate (10), and the support shaft (602) is inserted into the first long slot hole (1001).

6. The improved film blowing equipment according to claim 5, characterized in that: The first transmission assembly (603) includes a width adjustment unit and a height adjustment unit; The width adjustment unit comprises a connecting arm (6031) pivotally connected to the support shaft (602), two connecting arms (6031) pivotally connected to a pressing block (6033), and a first driving portion (6032) for driving the pressing block (6033) to move up and down; The first driving part (6032) is connected above the fixing plate (701), and the center line of the pressing block (6033) coincides with the center line of the frame (601); The connecting arms (6031) are arranged in a one-to-one correspondence with the supporting shafts (602).

7. The improved film blowing equipment according to claim 6, characterized in that: The height adjustment unit includes a second screw rod (6034) connected to the support shaft (602) and a third driving part (6035) for driving the second screw rod (6034) to rotate; An adjustment plate (6036) is provided at one end of the support plate (6011) close to the support shaft (602), and the adjustment plate (6036) is arranged along the extension direction of the support plate (6011). A second long slot hole (60361) is provided in the extension direction of the adjustment plate (6036), and the second screw (6034) passes through the adjustment plate (6036) along the length direction.

8. The improved film blowing equipment according to claim 7, characterized in that: The balancing frame (604) includes rotating arms (6041) respectively arranged on both sides of the split body, a first connecting shaft (6042) passing through the two rotating arms (6041), and a second connecting shaft (6043) vertically connected between the two split bodies; The first connecting shaft (6042) and the second connecting shaft (6043) are connected via a shaft seat (6044); Linear bearings are provided between the first connecting shaft (6042), the second connecting shaft (6043) and the shaft seat (6044).

9. The improved film blowing equipment according to claim 8, characterized in that: The adjustment assembly (704) includes a fixed shaft (7041) connected to the fixed plate (701), a first frame (705), a second frame (706), and a third frame (707) sequentially sleeved on the fixed shaft (7041), a rotating shaft (7042) connected to the rotating frame (702), and a gear set for driving the frame to rotate; A plurality of tensioning rollers (7048) are respectively pivotally connected to a plurality of the frames; The gear set includes a first gear (7043) and a second gear (7044) connected to the rotating shaft (7042), and a third gear (7045) and a fourth gear (7046) connected to the fixed shaft (7041); The first frame (705) is connected to the third gear (7045), and the third frame (707) is connected to the fourth gear (7046); The first gear (7043) and the third gear (7045) are meshed and driven, and the second gear (7044) and the fourth gear (7046) are meshed and driven; The fixed shaft (7041) is further connected to a fourth driving unit (7047), and a power output end of the fourth driving unit (7047) is connected to the second frame (706); The fourth driving part (7047) is connected to the rotating shaft (7042) via a mounting seat.

10. A film blowing process, characterized in that: The improved film blowing equipment according to any one of claims 3 to 9 is used, which specifically includes the following steps: S1. Raw material preparation: plastic particles are mixed in a predetermined ratio and the moisture is removed through a drying process; S2, extrusion film forming, in the extrusion barrel (1), the plastic particles are melted and pass through the die head (3) to form a continuous molten plastic flow; S3, blowing and cooling, the molten plastic is cooled and blown by the air ring to gradually form a film bubble; S4, splinting treatment, the film bubble passes through the herringbone frame (6) in the longitudinal direction, and the angle of the herringbone frame (6) is adjusted by the first transmission component (603) and the second transmission component (605), and the film bubble is squeezed and converted into a sheet; S5, stretching process, the film that has been cooled and solidified is stretched by a traction mechanism (7). During the traction process, the tension of the film is measured by a pressure sensor. When the tension exceeds a predetermined threshold, the adjustment component (704) is activated to adjust the angle of the tension roller (7048) until the tension of the film reaches the predetermined threshold; S6, trimming and winding, after trimming the waste edges on both sides of the film, the winding machine rewinds it online.

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